tools/openocd: Fix Flash probing for nucleo-f747zi
tools/openocd: Fix Flash probing for nucleo-f747zi

ant9000/RIOT,kYc0o/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,kYc0o/RIOT,authmillenon/RIOT,authmillenon/RIOT,OlegHahm/RIOT,miri64/RIOT,basilfx/RIOT,yogo1212/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,smlng/RIOT,yogo1212/RIOT,kYc0o/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,kaspar030/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,miri64/RIOT,jasonatran/RIOT,smlng/RIOT,basilfx/RIOT,jasonatran/RIOT,kaspar030/RIOT,yogo1212/RIOT,yogo1212/RIOT,ant9000/RIOT,smlng/RIOT,miri64/RIOT,OTAkeys/RIOT,ant9000/RIOT,smlng/RIOT,jasonatran/RIOT,basilfx/RIOT,miri64/RIOT,yogo1212/RIOT,OlegHahm/RIOT,miri64/RIOT,basilfx/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,kYc0o/RIOT,ant9000/RIOT,authmillenon/RIOT,basilfx/RIOT,authmillenon/RIOT,authmillenon/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kaspar030/RIOT,smlng/RIOT,ant9000/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,jasonatran/RIOT